Vogel model
Colour
Readouts
Seeds shown
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Angle
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Offset from golden
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Spirals (cw / ccw)
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Vogel (1979): theta_n = n*delta, r_n = c*sqrt(n). Golden angle = 360/phi^2 = 137.5078 deg. Visible spiral counts are denominators of continued-fraction convergents of delta/360.